Good attempt, would recommend more practice.
It's a good start. It's difficult to tackle anatomy when you aren't very well acquainted with it. Most community colleges offer Life drawing sessions for very cheap, and it's one of the best ways to become familiar with the human form (or just form and light in general, for that matter).
The trees and stuff works, and I like the outside cover, but it's definitely clashing with your illustration. I think some well done inking with watercolor styled painting (or preferably real watercolor on Arches watercolor paper or something) would work well with the kind of 'fairy tale' theme that Brackenwood tackles. Keep trying!